MADRID, Jan 17 (Reuters) - Spanish telecoms group Telefonica has issued a combined 1.75 billion euros ($1.9 billion) in green bonds, the company said in a filing to stock market regulator CNMV on Wednesday.

The issue, made through Telefonica's wholly-owned subsidiary Telefonica Emisiones, was split into two tranches of 1 billion euros with a 2032 maturity paying a coupon of 3.698%, and 750 million euros with a 2036 maturity and coupon of 4.055%.

The net proceeds will be used to fund sustainable investments such as infrastructure modernisation and energy-saving measures, according to the company. ($1 = 0.9211 euros) (Reporting by David Latona; Editing by Kirsten Donovan)